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Medium and Heavy Trucks

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Hi my name is***** will be glad to help. What is your engine serial number and are you getting any fault codes? This could be a mechanical failure like a rod, piston, push rod, rocker arm etc or most commonly if all those check out ok is a faulty injector or Jake brake problem. Is the check engine light coming on and if so what codes do you have?

Check the oil and filter for signs of metal/debris indicating a mechanical internal failure and if clean do an injector cutout test if misfiring to isolate a possible faulty injector or injector harness. Let me know

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Customer reply replied 2 years ago

no engine light no fault codes oil and filter just changed no sign of any debris or leaks exhaust manifold and intake manifold just replaced all turbo gaskets replaced

Customer reply replied 2 years ago

serial number is *****

Customer reply replied 2 years ago

how do you do an injector cut out test?

Customer reply replied 2 years ago

runs fine no loss of power no other indication of an issue other than loud hammering noise ...louder when sitting at idle and the puff of smoke when first started up

Customer reply replied 2 years ago

just a rhythmic consistent hammering noise seems to smooth out a little when running at higher rpm

Were any of the exhaust ports wet with oil/fuel for any cylinders? Using a digital temp reader take temps for each exhaust port looking for a cold cylinder indicating a potential injector problem. Then using noid lights from an auto store check for strong injector voltage for potential injector driver issues in the ECM or injector harness problems. If that checks ok then using Cummins Insite you can do an injector cut out test or unplug each cylinder one at a time and listen for a change

I will tell you that...the things you have to go through to be an Expert are quite rigorous.

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.